John 9:32
Since the world began was it not heard that any man opened the eyes of one that was born blind.
Cross-reference
John 9:1
Historical context
John 9:1 establishes the man was blind from birth, the very fact that makes Jesus' healing unprecedented in John 9:32.
John 10:21
Allusion
John 10:21 echoes the miracle, asking 'Can a demon open the eyes of the blind?' reinforcing the unprecedented divine sign in John 9:32.
John 15:24
Parallel
John 15:24 speaks of Jesus doing works no one else did, paralleling the unique healing of a man born blind in John 9:32.
Mark 2:12
Parallel
Mark 2:12 records amazement at the paralytic's healing with 'We never saw anything like this' — similar to John's claim of an unprecedented healing of congenital blindness.